I can't speak to AP Micro, but college Micro 101 is not heavily quantitative in the formal sense. Very few equations. It is highly logical, though, and (depending on the teacher), there might be some mathematical relationships formalized (e.g., direct and inverse variation). The typical course uses a lot of graphs (upward-sloping supply, downward demand), and the concept of change (margins) is important. So it's math-y but not formalized. Undergraduate econ doesn't get very quantitative in the formal sense (I speak as a former econ major). They had us take Calc, but we rarely used it. Grad school is a whole different story!
